bug #6822 fix: remaining calls to deprecated getReferrer method (AirBair)

This PR was merged into the 4.x branch.

Discussion
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fix: remaining calls to deprecated getReferrer method

Hi,

Small PR to fix deprecations caused by remaining calls still made to the deprecated `getReferrer()` method in #6684

Commits
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559e531 fix: remaining calls to deprecated getReferrer method

Author: javiereguiluz

src/Controller/AbstractCrudController.php

@@ -387,7 +387,7 @@ public function delete(AdminContext $context)
             return $event->getResponse();
         }
 
-        if (null !== $referrer = $context->getReferrer()) {
+        if (null !== $referrer = $context->getRequest()->headers->get('referrer')) {
             return $this->redirect($referrer);
         }
 
@@ -450,7 +450,7 @@ public function batchDelete(AdminContext $context, BatchActionDto $batchActionDt
             return $event->getResponse();
         }
 
-        return $this->redirect($batchActionDto->getReferrerUrl());
+        return $this->redirect($context->getRequest()->headers->get('referer'));
     }
 
     public function autocomplete(AdminContext $context): JsonResponse
@@ -638,7 +638,7 @@ protected function getRedirectResponseAfterSave(AdminContext $context, string $a
                 ->setAction(Action::EDIT)
                 ->setEntityId($context->getEntity()->getPrimaryKeyValue())
                 ->generateUrl(),
-            Action::SAVE_AND_RETURN => $context->getReferrer()
+            Action::SAVE_AND_RETURN => $context->getRequest()->headers->get('referer')
                 ?? $this->container->get(AdminUrlGenerator::class)->setAction(Action::INDEX)->generateUrl(),
             Action::SAVE_AND_ADD_ANOTHER => $this->container->get(AdminUrlGenerator::class)->setAction(Action::NEW)->generateUrl(),
             default => $this->generateUrl($context->getDashboardRouteName()),